Measurement of Aureole and Suppression of Internal Stray Light of Aureole Photometer

Document Type

Article

Publication Date

10-1-2011

Abstract

A modern aureole photometer (AP) was developed for the site survey inWest China, in preparation for the installation of future large solar equipments. The performance of this new AP was tested in preliminary observations, and a lot of sky brightness data were accumulated at a few sites in Yunnan Province. The result of data analysis shows that the aureole near the noon time on Jiaozi Snow Mountain is as low as a few millionths of the intensity at the solar disk center, indicating the low internal stray light level of our instrument. The internal stray light of the AP comes mainly from two parts: the edge diffraction of the ferrule for fixing the ND4 filter in the front end of the telescope tube, causing the stray light distributed in the inner region of the field of view, and the edge diffractions of the diaphragms placed inside the telescope tube, causing the stray light distributed in the outer region of the field of view. In order to suppress the stray light of the latter part, the experiment to change the aperture size of an additional diaphragm was performed. The result shows that the stray light in the outer region of the field of view can be effectively suppressed by reducing properly the aperture size of the diaphragm. © 2011.

Identifier

80755180859 (Scopus)

Publication Title

Chinese Astronomy and Astrophysics

External Full Text Location

https://doi.org/10.1016/j.chinastron.2011.10.010

ISSN

02751062

First Page

428

Last Page

438

Issue

4

Volume

35

Grant

0847126

Fund Ref

National Science Foundation

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